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If it is stock (I assume it is) all you need is the stock AC Delco spark plugs, the MSD wires are a good idea, but again with a stock setup not a requirement. If you can get them for a good price then go ahead. A new water pump is not a bad idea (change the seal too) and the Opti. I have heard bad things about the ones on ebay, like they are cheap subs for the real AC Delco ones.

3.73's is a good setup (make sure you get the reluctor changed too), I loved it when I put them in my car. $600-$650 for parts and labor is not a bad deal.
 
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